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计算机工程 ›› 2012, Vol. 38 ›› Issue (23): 19-23. doi: 10.3969/j.issn.1000-3428.2012.23.005

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基于椭圆曲线的KDM安全公钥加密方案

谢小容1,王鲲鹏2   

  1. (1. 中国科学院研究生院信息安全国家重点实验室,北京 100049;2. 中国科学院研究生院信息工程所,北京 100195)
  • 收稿日期:2012-02-27 出版日期:2012-12-05 发布日期:2012-12-03
  • 作者简介:谢小容(1987-),女,硕士研究生,主研方向:椭圆曲线密码学,单向函数比特安全;王鲲鹏,副教授
  • 基金资助:

    国家自然科学基金资助项目(60970153);中国科学院战略性先导专项基金资助项目“海云信息安全共性关键技术研究”(XDA06010 702)

Public Key Encryption Scheme with KDM Security Based on Elliptic Curves

XIE Xiao-rong 1, WANG Kun-peng 2   

  1. (1. State Key Laboratory of Information Security, Graduate University of Chinese Academy of Sciences, Beijing 100049, China; 2. Institute of Information Engineering, Graduate University of Chinese Academy of Sciences, Beijing 100195, China)
  • Received:2012-02-27 Online:2012-12-05 Published:2012-12-03

摘要:

某些场合下敌手能够获取与私钥有关消息的密文,大多现有加密方案在上述情况下是不安全的。为抵抗这种攻击,给出一般子群不可区分困难假设的一个实例——椭圆曲线子群不可区分困难假设,并设计相应的归约算法。在此基础上,提出一个基于环 上椭圆曲线的公钥加密方案,并将该方案中的密文不可区分问题归约到椭圆曲线子群不可区分困难的假设上。分析结果证明,该方案在此假设下是安全的。

关键词: 密钥相关消息安全, 公钥加密方案, 椭圆曲线, 子群不可区分, 环, 自加密

Abstract:

Most public key encryption schemes are unsecure, if a polynomial time adversary can get ciphertexts that are dependent on the secret key. In order to defend the attacks, this paper gives an instance of the general subgroup indistinguishability assumption——elliptic curve subgroup indistinguishability assumption and a reduction algorithm. It is the first to construct a public key scheme based on elliptic curves over ring and reduce the indistinguishability of the ciphertexts to elliptic curve subgroup indistinguishability assumption. The scheme is proved secure under the assumption.

Key words: Key Dependent Message(KDM) security, public key encryption scheme, elliptic curve, subgroup indistinguishability, ring, self-encryption

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